突然大笑

• Sir henry suddenly gave vent to a great roar of laughter and slapped his knee
  亨利爵士突然大笑起来，打断了她的说话。
• He struck into a laugh when we were talking seriously about the matter
  我们正在严肃认真地谈论问题，他们突然大笑起来。
• Dark feather covered my eyes , i cachinnated and walked away after a while , with singing a reqiuem softly
  黑色的羽毛盖上了我的眼睛，我突然大笑，过了一会儿我哼著安魂曲离开。